Black Screen after login Ubuntu guest on OS 10.10.1

[UMDinfo]

I've spent a considerable amount of time trying to fix a VB of Ubuntu 14.04 and I cannot seem to get this to work. It boots fine but boots to a black screen I can get the tty1 display to work but my efforts to get an X display working are fruitless. Please help!!!

[socratis]

A quick search can go long ways...
- viewtopic.php?f=3&t=64618
- viewtopic.php?f=6&t=64981

[UMDinfo]

host+F1 then host+f7 doesn't fix anything.

[loukingjr]

host+F1 then host+f7 doesn't fix anything.

actually that fix is for a problem with the Ubuntu 14.10 & 15.04 installers. Not to fix a previously installed guest. Has your guest ever worked? Please attached a zipped copy of the vbox.log file.

[UMDinfo]

I ended up reinstalling my guest and redoing everything. Everything was working just fine. Now it has happened again after a reboot. I've attached my log files.

[Perryg]

Did you enable 3D acceleration in the video settings for the guest?

[UMDinfo]

yes that is enabled.

[Perryg]

Then you need to post the guests /var/log/vboxadd-install.log and /var/log/Xorg.0.log files as an attachment.

[loukingjr]

according to the vbox.log you posted you have 5 cores assigned to the guest? Try reducing that to 2. You also have 4GB of RAM assigned to the guest,. Try reducing that to 2GB. You only have a little under 5GB available.

I don't know what this is:

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00:00:01.253042   StreamName  <string>  = "BioData_Training" (cb=17)

mine says:

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00:00:00.678509   StreamName  <string>  = "Ubuntu 14.04 LTS" (cb=17)

[loukingjr]

Your MacBook Pro Retina has two GPUs (Intel HD Graphics 4000 & NVIDIA GeForce GT 650M) and one has automatic switching. I personally don't know how to force a guest to use just one of the GPUs but perhaps someone else does. You should still change your guest settings.

[UMDinfo]

I changed all the the settings with no luck. Here are the log files that were requested.

[loukingjr]

I suspect the reason it seemed to work then turned black is because it it's using the wrong GPU. I've never owned a Retina Mac so I can't help there. do a search on the forum for "Retina". I'm sure there are many posts.

[Perryg]

Can I assume this is from you trying to run with 3D disabled?

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8.115] (EE) Failed to initialize GLX extension (Compatible NVIDIA X driver not found)

Can you dbl check the it is enabled and then post the following from the guests terminal?

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cat /var/log/Xorg.0.log | grep GLX

[loukingjr]

Just to add something, Retina Macs with dual GPUs automatically switch depending on the application and the need. I read there is no manual way to force the use of one or the other other than a hack.

[UMDinfo]

3d is definitely enabled. here is the GLX Xorg.

Do I need a new driver?